Overbearing sister causing overwhelm?

Hi there. I only just told my sister 3 days ago I was pregnant, she is a mum of 2 and pregnant with her third and extremely passionate about everything to do with motherhood. I am very quietly processing my own big news and not ready to talk about and probably won’t want to until I am 12 weeks. I told her this when I told her my news and she said she understood and respected my decision.

I thought I would share the very brief update about scan details and she bombarded me and overwhelmed me and while I answered a few questions politely I then asked, if we could please change the subject. She was wildly upset and now there is a lot of anxiety about me talking to her again about any updates. Has anyone had a similar situation or have a similar bery loving but overbearing sister that causes serious overwhelm?